Camera optical lens

ABSTRACT

The present disclosure provides a camera optical lens including, from an object side to an image side in sequence: a first lens, a second, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens; the first lens has a positive refractive power, and the camera optical lens satisfies conditions of: 0.95≤f/TTL; 2.00≤f2/f≤5.00; and 0.20≤(R15+R16)/(R15−R16)≤0.90. The camera optical lens can achieve good optical performance while meeting the design requirements for large aperture, long focal length and ultra-thinness.

TECHNICAL FIELD

The present disclosure relates to the field of optical lens, particular, to a camera optical lens suitable for handheld devices, such as smart phones and digital cameras, and imaging devices, such as monitors or PC lenses.

BACKGROUND

With the emergence of smart phones in recent years, the demand for miniature camera lens is increasing day by day, but in general the photosensitive devices of camera lens are nothing more than Charge Coupled Device (CCD) or Complementary Metal-Oxide Semiconductor Sensor (CMOS sensor), and as the progress of the semiconductor manufacturing technology makes the pixel size of the photosensitive devices become smaller, plus the current development trend of electronic products towards better functions and thinner and smaller dimensions, miniature camera lens with good imaging quality therefore have become a mainstream in the market.

In order to obtain better imaging quality, the lens that is traditionally equipped in mobile phone cameras adopts a three-piece, four-piece, or even five-piece or six-piece lens structure. However, with the development of technology and the increase of the diverse demands of users, and as the pixel area of photosensitive devices is becoming smaller and smaller and the requirement of the system on the imaging quality is improving constantly, the eight-piece lens structure gradually appears in lens designs. Although the typical eight-piece lens already has good optical performance, its optical power, lens spacing and lens shape remain unreasonable to some extents, resulting in that the lens structure, which, even though, has excellent optical performance, is not able to meet the design requirement for large aperture, long focal length and ultra-thinness.

Thus, there is a need to provide a camera optical lens having excellent optical performance and meeting the design requirement for large aperture, long focal length and ultra-thinness.

SUMMARY

To address the above issues, an object of the present disclosure is to provide a camera optical lens that meets a design requirement of large aperture, long focal length and ultra-thinness while having excellent optical performance.

For solving the above technical problem, embodiments of the present disclosure provide a camera optical lens. The camera optical lens includes, from an object side to an image side in sequence: a first lens, a second, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens; the first lens has a positive refractive power, and the camera optical lens satisfies conditions of: 0.95≤f/TTL; 2.00≤f2/f≤5.00; and 0.20≤(R15+R16)/(R15−R16)≤0.90; where TTL denotes a total optical length from an object-side surface of the first lens to an image surface of the camera optical lens along an optical axis; f denotes a focal length of the camera optical lens; f2 denotes a focal length of the second lens; R15 denotes a central curvature radius of an object-side surface of the eighth lens; and R16 denotes a central curvature radius of an image-side surface of the eighth lens.

As an improvement, the camera optical lens further satisfies a condition of: 2.50≤R9/R10≤22.00; where R9 denotes a curvature radius of an object-side surface of the fifth lens; and R10 denotes a curvature radius of an image-side surface of the fifth lens.

As an improvement, the camera optical lens further satisfies conditions of: 0.29≤f1/f≤0.88; −2.28≤(R1+R2)/(R1−R2)≤−0.74; and 0.08≤d1/TTL≤0.24; where f1 denotes a focal length of the first lens; R1 denotes a central curvature radius of the object-side surface of the first lens; R2 denotes a central curvature radius of an image-side surface of the first lens; and d1 denotes an on-axis thickness of the first lens.

As an improvement, the camera optical lens further satisfies conditions of: 0.16≤(R3+R4)/(R3−R4)≤0.88; and 0.03≤d3/TTL≤0.10; where R3 denotes a central curvature radius of an object-side surface of the second lens; R4 denotes a central curvature radius of an image-side surface of the second lens; and d3 denotes an on-axis thickness of the second lens.

As an improvement, the camera optical lens further satisfies conditions of: −1.13≤f3/f≤−0.37; 0.46≤(R5+R6)/(R5−R6)≤1.50; and 0.02≤d5/TTL≤0.06; where f3 denotes a focal length of the third lens; R5 denotes a central curvature radius of an object-side surface of the third lens; R6 denotes a central curvature radius of an image-side surface of the third lens; and d5 denotes an on-axis thickness of the third lens.

As an improvement, the camera optical lens further satisfies conditions of: 0.58≤f4/f≤2.10; −11.49≤(R7+R8)/(R7−R8)≤−3.58; and 0.02≤d7/TTL≤0.07; where f4 denotes a focal length of the fourth lens; R7 denotes a central curvature radius of an object-side surface of the fourth lens; R8 denotes a central curvature radius of an image-side surface of the fourth lens; and d7 denotes an on-axis thickness of the fourth lens.

As an improvement, the camera optical lens further satisfies following conditions: −3.14≤f5/f≤−0.92; 0.55≤(R9+R10)/(R9−R10)≤3.47; and 0.02≤d9/TTL≤0.06; where f5 denotes a focal length of the fifth lens; R9 denotes a curvature radius of an object-side surface of the fifth lens; R10 denotes a curvature radius of an image-side surface of the fifth lens; and d9 denotes an on-axis thickness of the fifth lens.

As an improvement, the camera optical lens further satisfies a condition of: 1.56≤f6/f≤5.08; 0.52≤(R11+R12)/(R11−R12)≤1.70; and 0.03≤d11/TTL≤0.09; where f6 denotes a focal length of the sixth lens; R11 denotes a central curvature radius of an object-side surface of the sixth lens; R12 denotes a central curvature radius of an image-side surface of the sixth lens; and d11 denotes an on-axis thickness of the sixth lens.

As an improvement, the camera optical lens further satisfies a condition of: −7.59≤f7/f≤−2.07; 3.16≤(R13+R14)/(R13−R14)≤11.46; and 0.02≤d13/TTL≤0.06; where f7 denotes a focal length of the seventh lens; R13 denotes a central curvature radius of an object-side surface of the seventh lens; R14 denotes a central curvature radius of an image-side surface of the seventh lens; and d13 denotes an on-axis thickness of the seventh lens.

As an improvement, the camera optical lens further satisfies a condition of: −5.53≤f8/f≤−1.48; and 0.04≤d15/TTL≤0.14; where f8 denotes a focal length of the eighth lens; and d15 denotes an on-axis thickness of the eighth lens.

As an improvement, the camera optical lens further satisfies a condition of: FNO≤1.87; where FNO denotes an F number of the camera optical lens.

As an improvement, the camera optical lens further satisfies a condition of: f/IH≥2.23; where IH denotes an image height of the camera optical lens.

As an improvement, the camera optical lens further satisfies a condition of: TTL/IH≤2.18; where IH denotes an image height of the camera optical lens.

The present disclosure is advantageous in: the camera optical lens in the present disclosure has excellent optical performance and has characteristics of large aperture, long focal length and ultra-thinness, and is especially applicable to mobile phone camera lens assemblies and WEB camera lenses composed by such camera elements as CCD and CMOS for high pixels.

BRIEF DESCRIPTION OF DRAWINGS

To illustrate the technical solutions according to the embodiments of the present disclosure or in the prior art more clearly, the accompanying drawings for describing the embodiments or the prior art are introduced briefly in the following. Apparently, the accompanying drawings in the following description are only some embodiments of the present disclosure, and persons of ordinary skill in the art can derive other drawings from the accompanying drawings without creative efforts.

FIG. 1 is a schematic diagram of a structure of a camera optical lens according to Embodiment 1 of the present disclosure.

FIG. 2 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 1.

FIG. 3 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 1.

FIG. 4 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 1.

FIG. 5 is a schematic diagram of a structure of a camera optical lens according to Embodiment 2 of the present disclosure.

FIG. 6 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 5.

FIG. 7 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 5.

FIG. 8 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 5.

FIG. 9 is a schematic diagram of a structure of a camera optical lens according to Embodiment 3 of the present disclosure.

FIG. 10 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 9.

FIG. 11 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 9.

FIG. 12 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 9.

DETAILED DESCRIPTION OF EMBODIMENTS

To make the objects, technical solutions, and advantages of the present disclosure clearer, embodiments of the present disclosure are described in detail with reference to accompanying drawings in the following. A person of ordinary skill in the art can understand that, in the embodiments of the present disclosure, many technical details are provided to make readers better understand the present disclosure. However, even without these technical details and any changes and modifications based on the following embodiments, technical solutions required to be protected by the present disclosure can be implemented.

Embodiment 1

Referring to the accompanying drawing, the present disclosure provides a camera optical lens 10. FIG. 1 shows a schematic diagram of a camera optical lens 10 according to Embodiment 1 of the present disclosure, and the camera optical lens 10 includes eight lenses. Specifically, an object side refers to the left side, an image side refers to the right side, and the camera optical lens 10 includes, from the object side to the image side in sequence: an aperture S1, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7 and an eighth lens L8. An optical element such as an optical filter GF can be arranged between the eighth lens L8 and an image surface Si.

In this embodiment, the first lens L has a positive refractive power, the second lens L2 has a positive refractive power, the third lens L3 has a negative refractive power, the fourth lens L4 has a positive refractive power, the fifth lens L5 has a negative refractive power, the sixth lens L6 has a positive refractive power, the seventh lens L7 has a negative refractive power and the eighth lens L8 has a negative refractive power. It should be appreciated that, in other embodiments, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 may have other refractive powers than those of this embodiment.

In this embodiment, the first lens L1 has a positive refractive power, which facilitates improving performance of the camera optical lens.

In this embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 are made of plastic material. In other embodiments, the lenses may be made of other material.

In this embodiment, a total optical length from the object side surface of the first lens L1 to an image surface Si of the camera optical lens 10 along an optical axis is defined as TTL, a focal length of the camera optical lens 10 is defined as f, a focal length of the second lens L2 is defined as f2, a central curvature radius of the object-side surface of the eighth lens L8 is defined as R15, and a central curvature radius of the image-side surface of the eighth lens L8 is defined as R16. The camera optical lens 10 satisfies conditions of:

0.95≤f/TTL;  (1)

2.00≤f2/f≤5.00; and  (2)

0.20≤(R15+R16)/(R15−R16)≤0.90.  (3)

Condition (1) specifies a ratio of the focal length of the camera optical lens 10 and the total optical length of the camera optical lens 10. When the relation meets the condition (1), given a same total optical length, the camera optical lens 10 has the focal length longer. Preferably, the camera optical lens 10 satisfies a condition of 0.99≤f/TTL.

Condition (2) specifies a ratio of the focal length of the second lens L2 to the focal length of the camera optical lens 10. Within this condition, a spherical aberration and a field curvature of the camera optical lens 10 can be effectively balanced.

Condition (3) specifies a shape of the eighth lens L8. Within this condition, correction of the off-axis aberration is facilitated.

A central curvature radius of the object-side surface of the fifth lens L5 is defined as R9, and a central curvature radius of the image-side surface of the fifth lens L5 is defined as R10. The camera optical lens 10 satisfies a condition of 2.50≤R9/R10≤22.00, which specifies a shape of the fifth lens L5. Within this condition, the deflection degree of the light passing through the lens can be alleviated, and the aberration can be effectively reduced.

In this embodiment, the first lens L1 includes an object-side surface being convex in a paraxial region and an image-side surface being concave in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the first lens is defined as f1. The camera optical lens 10 satisfies a condition of 0.29≤f1/f≤0.88, which specifies a ratio of the focal length of the first lens L1 to the focal length of the camera optical lens 10. Within this condition, the first lens L1 has an appropriate positive refractive power, the correction of the aberration of the camera optical lens 10 is facilitated, and meanwhile the development of the camera optical lens 10 towards ultra-thinness is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 0.46≤f1/f≤0.70.

A central curvature radius of an object-side surface of the first lens L1 is defined as R1, and a central curvature radius of an image-side surface of the first lens L1 is defined as R2. The camera optical lens 10 satisfies a condition of −2.28≤(R1+R2)/(R1−R2)≤−0.74. This can reasonably control a shape of the first lens L1 in such a manner that the first lens L1 can effectively correct a spherical aberration of the camera optical lens 10. Preferably, the camera optical lens 10 satisfies a condition of −1.42≤(R1+R2)/(R1−R2)≤−0.92.

The total optical length of the camera optical lens 10 is defined as TTL, and an on-axis thickness of the first lens L1 is defined as d1. The camera optical lens 10 satisfies a condition of 0.08≤d1/TTL≤0.24. Within this condition, ultra-thinness of the lenses is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 0.13≤d1/TTL≤0.19.

In this embodiment, the second lens L2 includes an object-side surface being convex in a paraxial region and an image-side surface being convex in the paraxial region.

A central curvature radius of the object-side surface of the second lens L2 is defined as R3, and a central curvature radius of the image-side surface of the second lens L2 is defined as R4. The camera optical lens 10 satisfies a condition of 0.16≤(R3+R4)/(R3−R4)≤0.88, which specifies a shape of the second lens L2. With development of the camera optical lens 10 towards ultra-thinness, correction of the on-axis chromatic aberration is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 0.25≤(R3+R4)/(R3−R4)≤0.70.

The total optical length of the camera optical lens 10 is defined as TTL, and an on-axis thickness of the second lens L2 is defines as d3. The camera optical lens 10 satisfies a condition of 0.03≤d3/TTL≤0.10. Within this condition, ultra-thinness of the lenses is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 0.05≤d3/TTL≤0.08.

In this embodiment, the third lens L3 includes an object-side surface being concave in a paraxial region and an image-side surface being concave in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the third lens L3 is defined as f3. The camera optical lens 10 satisfies a condition of −1.13≤f3/f≤−0.37. With reasonable distribution of the refractive power, the camera optical lens 10 has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies a condition of −0.71≤f3/f≤−0.46.

A central curvature radius of the object-side surface of the third lens L3 is defined as R5, and a central curvature radius of the image-side surface of the third lens L3 is defined as R6. The camera optical lens 10 satisfies a condition of 0.46≤(R5+R6)/(R5−R6)≤1.50, which effectively controls a shape of the third lens L3 and facilitates shaping of the third lens L3. Within this condition, the deflection degree of the light passing through the lens can be alleviated, and the aberration can be effectively reduced. Preferably, the camera optical lens 10 satisfies a condition of 0.74≤(R5+R6)/(R5−R6)≤1.20.

The total optical length of the camera optical lens 10 is defined as TTL, and an on-axis thickness of the third lens L3 is defined as d5. The camera optical lens 10 satisfies a condition of 0.02≤d5/TTL≤0.06. Within this condition, ultra-thinness of the lenses is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 0.03≤d5/TTL≤0.05.

In this embodiment, the fourth lens L4 includes an object-side surface being convex in a paraxial region and an image-side surface being concave in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the fourth lens L4 is defined as f4. The camera optical lens 10 satisfies a condition of 0.58≤f4/f≤2.10, which specifies a ratio of the focal length of the fourth lens L4 and the focal length of the camera optical lens 10. Within this condition, improvement of performance of the camera optical lens 10 is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 0.93≤f4/f≤1.68.

A central curvature radius of the object-side surface of the fourth lens L4 is defined as R7, and a central curvature radius of the image-side surface of the fourth lens L4 is defined as R8. The camera optical lens 10 satisfies a condition of −11.49≤(R7+R8)/(R7−R8)≤−3.58, which specifies a shape of the fourth lens L4. Within this condition, the development of the lenses towards ultra-thinness would facilitate correcting the off-axis aberration. Preferably, the camera optical lens 10 satisfies a condition of −7.18≤(R7+R8)/(R7−R8)≤−4.48.

The total optical length of the camera optical lens 10 is defined as TTL, and an on-axis thickness of the fourth lens L4 is defined as d7. The camera optical lens 10 satisfies a condition of 0.02≤d7/TTL≤0.07. Within this condition, ultra-thinness of the lenses is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 0.04≤d7/TTL≤0.06.

In this embodiment, the fifth lens L5 includes an object-side surface being convex in a paraxial region and an image-side surface being concave in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the fifth lens L5 is defined as f5. The camera optical lens 10 satisfies a condition of −3.14≤f5/f≤−0.92, which specifies the fifth lens L5 so as to enable the light angle of the camera optical lens 10 to be gradual and reduce the tolerance sensitivity. Preferably, the camera optical lens 10 satisfies a condition of −1.96≤f5/f≤−1.15.

A central curvature radius of the object-side surface of the fifth lens L5 is defined as R9, and a central curvature radius of the image-side surface of the fifth lens L5 is defined as R10. The camera optical lens 10 satisfies a condition of 0.55≤(R9+R10)/(R9−R10)≤3.47, which specifies a shape of the fifth lens L5. Within this condition, the development of the lenses towards ultra-thinness would facilitate correcting the off-axis aberration. Preferably, the camera optical lens 10 satisfies a condition of 0.88≤(R9+R10)/(R9−R10)≤2.77.

The total optical length of the camera optical lens 10 is defined as TTL, and an on-axis thickness of the fifth lens L5 is defined as d9. The camera optical lens 10 satisfies a condition of 0.02≤d9/TTL≤0.06. Within this condition, ultra-thinness of the lenses is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 0.03≤d9/TTL≤0.05.

In this embodiment, the sixth lens L6 includes an object-side surface being concave in a paraxial region and an image-side surface being convex in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the sixth lens L6 is defined as f6. The camera optical lens 10 satisfies a condition of 1.56≤f6/f≤5.08. With reasonable distribution of the refractive power, the camera optical lens 10 has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies a condition of 2.50≤f6/f≤4.07.

A central curvature radius of an object-side surface of the sixth lens L6 is defined as R11, and a central curvature radius of an image-side surface of the sixth lens L6 is defined as R12. The camera optical lens 10 satisfies a condition of 0.52≤(R11+R12)/(R11−R12)≤1.70, which specifies a shape of the sixth lens L6. Within this condition, the development of the lenses towards ultra-thinness would facilitate correcting the off-axis aberration. Preferably, the camera optical lens 10 satisfies a condition of 0.82≤(R11+R12)/(R11−R12)≤1.36.

The total optical length of the camera optical lens 10 is defined as TTL, and an on-axis thickness of the sixth lens L6 is defined as d11. The camera optical lens 10 satisfies a condition of 0.03≤d11/TTL≤0.09. Within this condition, ultra-thinness of the lenses is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 0.05≤d11/TTL≤0.08.

In this embodiment, the seventh lens L7 includes an object-side surface being convex in a paraxial region and an image-side surface being concave in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the seventh lens L7 is defined as f7. The camera optical lens 10 satisfies a condition of −7.59≤f7/f≤−2.07. With reasonable distribution of the refractive power, the camera optical lens 10 has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies a condition of −4.75≤f7/f≤−2.59.

A central curvature radius of the object-side surface of the seventh lens L7 is defined as R13, and a central curvature radius of the image-side surface of the seventh lens L7 is defined as R14. The camera optical lens 10 satisfies a condition of 3.16≤(R13+R14)/(R13−R14)≤11.46, which specifies a shape of the seventh lens L7. Within this condition, the development of the lenses towards ultra-thinness would facilitate correcting the off-axis aberration. Preferably, the camera optical lens 10 satisfies a condition of 5.06≤(R13+R14)/(R13−R14)≤9.17.

The total optical length of the camera optical lens 10 is defined as TTL, and an on-axis thickness of the seventh lens L7 is defined as d13. The camera optical lens 10 satisfies a condition of 0.02≤d13/TTL≤0.06. Within this condition, ultra-thinness of the lenses is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 0.03≤d13/TTL≤0.05.

In this embodiment, the eighth lens L8 includes an object-side surface being concave in a paraxial region and an image-side surface being concave in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the eighth lens L8 is defined as f8. The camera optical lens 10 satisfies a condition of −5.53≤f8/f≤−1.48. With reasonable distribution of the refractive power, the camera optical lens 10 has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies a condition of −3.46≤f8/f≤−1.86.

The total optical length of the camera optical lens 10 is defined as TTL, and an on-axis thickness of the eighth lens L8 is defined as d15. The camera optical lens 10 satisfies a condition of 0.04≤d15/TTL≤0.14. Within this condition, ultra-thinness of the lenses is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 0.07≤d15/TTL≤0.11.

It should be appreciated that, in other embodiments, configuration of the object-side surfaces and the image-side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 may have a distribution in convex and concave other than that of the above-discussed embodiment.

In this embodiment, an F number of the camera optical lens 10 is defined as FNO, and the camera optical lens 10 satisfies a condition of FNO≤1.87. This enables the camera optical lens 10 to achieve large aperture and excellent imaging performance.

In this embodiment, an image height of the camera optical lens 10 is defined as IH, and the focal length of the camera optical lens 10 is defined as f. The camera optical lens 10 satisfies a condition of f/IH≥2.23, which enables the camera optical lens 10 to achieve long focal length.

In this embodiment, the image height of the camera optical lens 10 is defined as IH, and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies a condition of TTL/IH≤2.18, which facilitates ultra-thinness of the lenses.

In this embodiment, the focal length of the camera optical lens 10 is defined as f, and a combined focal length of the first lens L1 and of the second lens L2 is defined as f12. The camera optical lens 10 satisfies a condition of 0.24≤f12/f≤0.79. Within this condition, the aberration and distortion of the camera optical lens 10 can be eliminated and a back focal length of the camera optical lens is reduced, thereby maintaining miniaturization of the camera optical lens. Preferably, the camera optical lens 10 satisfies a condition of 0.38≤f12/f≤0.63.

When the above relationships are satisfied, the camera optical lens 10 meets the design requirements of large aperture, long focal length and ultra-thinness while having excellent optical imaging performance. Based on the characteristics of the camera optical lens 10, the camera optical lens 10 is particularly applicable to mobile camera lens assemblies and WEB camera lenses composed of such camera elements as CCD and CMOS for high pixels.

The camera optical lens 10 will be further described with reference to the following examples. Symbols used in various examples are shown as follows. The focal length, on-axis distance, central curvature radius, on-axis thickness, inflexion point position, and arrest point position are all in units of mm.

TTL: Total optical length (the distance from the object side surface of the first lens L1 to the image surface Si of the camera optical lens along the optical axis) in mm.

FNO: ratio of an effective focal length and an entrance pupil diameter of the camera optical lens.

In addition, inflexion points and/or arrest points can be arranged on the object-side surface and/or the image-side surface of the lenses, so as to satisfy the demand for high quality imaging. The description below can be referred for specific implementations.

The design data of the camera optical lens 10 in Embodiment 1 of the present disclosure are shown in Table 1 and Table 2.

TABLE 1 R d nd νd S1 ∞ d0= −0.842 R1 1.852 d1= 0.942 nd1 1.5444 ν1 55.82 R2 33.899 d2= 0.060 R3 45.835 d3= 0.382 nd2 1.5444 ν2 55.82 R4 −16.297 d4= 0.052 R5 −138.728 d5= 0.241 nd3 1.6701 ν3 19.39 R6 2.391 d6= 0.111 R7 1.741 d7= 0.283 nd4 1.6400 ν4 23.54 R8 2.496 d8= 0.215 R9 10.090 d9= 0.240 nd5 1.5444 ν5 55.82 R10 3.399 d10= 0.452 R11 −239.579 d11= 0.375 nd6 1.6701 ν6 19.39 R12 −12.656 d12= 0.590 R13 3.422 d13= 0.240 nd7 1.5444 ν7 55.82 R14 2.63 d14= 0.460 R15 −18.897 d15= 0.535 nd8 1.5444 ν8 55.82 R16 12.49 d16= 0.302 R17 ∞ d17= 0.110 ndg 1.5168 νg 64.17 R18 ∞ d18= 0.378

In the table, meanings of various symbols will be described as follows.

S1: aperture;

R: central curvature radius of an optical surface;

R1: central curvature radius of the object-side surface of the first lens L1;

R2: central curvature radius of the image-side surface of the first lens L1;

R3: central curvature radius of the object-side surface of the second lens L2;

R4: central curvature radius of the image-side surface of the second lens L2;

R5: central curvature radius of the object-side surface of the third lens L3;

R6: central curvature radius of the image-side surface of the third lens L3;

R7: central curvature radius of the object-side surface of the fourth lens L4;

R8: central curvature radius of the image-side surface of the fourth lens L4;

R9: central curvature radius of the object-side surface of the fifth lens L5;

R10: central curvature radius of the image-side surface of the fifth lens L5;

R11: central curvature radius of the object-side surface of the sixth lens L6;

R12: central curvature radius of the image-side surface of the sixth lens L6;

R13: central curvature radius of the object-side surface of the seventh lens L7;

R14: central curvature radius of the image-side surface of the seventh lens L7;

R15: central curvature radius of an object-side surface of the eighth lens L8;

R16: central curvature radius of an image-side surface of the eighth lens L8;

R17: central curvature radius of an object-side surface of the optical filter GF;

R18: central curvature radius of an image-side surface of the optical filter GF;

d: on-axis thickness of a lens and an on-axis distance between lenses;

d0: on-axis distance from the aperture S1 to the object-side surface of the first lens L1;

d1: on-axis thickness of the first lens L1;

d2: on-axis distance from the image-side surface of the first lens L1 to the object-side surface of the second lens L2;

d3: on-axis thickness of the second lens L2;

d4: on-axis distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3;

d5: on-axis thickness of the third lens L3;

d6: on-axis distance from the image-side surface of the third lens L3 to the object-side surface of the fourth lens L4;

d7: on-axis thickness of the fourth lens L4;

d8: on-axis distance from the image-side surface of the fourth lens L4 to the object-side surface of the fifth lens L5;

d9: on-axis thickness of the fifth lens L5;

d10: on-axis distance from the image-side surface of the fifth lens L5 to the object-side surface of the sixth lens L6;

d11: on-axis thickness of the sixth lens L6;

d12: on-axis distance from the image-side surface of the sixth lens L6 to the object-side surface of the seventh lens L7;

d13: on-axis thickness of the seventh lens L7;

d14: on-axis distance from the image-side surface of the seventh lens L7 to the object-side surface of the eighth lens L8;

d15: on-axis thickness of the eighth lens L8;

d16: on-axis distance from the image-side surface of the eighth lens L8 to the object-side surface of the optical filter GF;

d17: on-axis thickness of the optical filter GF;

d18: on-axis distance from the image-side surface of the optical filter GF to the image surface Si;

nd: refractive index of the d line;

nd1: refractive index of the d line of the first lens L1;

nd2: refractive index of the d line of the second lens L2;

nd3: refractive index of the d line of the third lens L3;

nd4: refractive index of the d line of the fourth lens L4;

nd5: refractive index of the d line of the fifth lens L5;

nd6: refractive index of the d line of the sixth lens L6;

nd7: refractive index of the d line of the seventh lens L7;

nd8: refractive index of the d line of the eighth lens L8;

ndg: refractive index of the d line of the optical filter GF;

νd: abbe number;

ν1: abbe number of the first lens L1;

ν2: abbe number of the second lens L2;

ν3: abbe number of the third lens L3;

ν4: abbe number of the fourth lens L4;

ν5: abbe number of the fifth lens L5;

ν6: abbe number of the sixth lens L6;

ν7: abbe number of the seventh lens L7;

ν8: abbe number of the eighth lens L8;

νg: abbe number of the optical filter GF.

Table 2 shows aspheric surface data of the camera optical lens 10 in Embodiment 1 of the present disclosure.

TABLE 2 Conic coefficient Aspheric surface coefficients k A4 A6 A8 A10 A12 R1 6.2697E−02 −9.4460E−03 2.4453E−03  2.3374E−03 −8.0042E−03   7.0261E−03 R2 3.9721E+02  1.8622E−02 2.8016E−03 −6.9051E−04 −4.3418E−04  −1.6350E−04 R3 4.6622E+02  2.5817E−02 1.2349E−03 −3.3787E−04 −7.9502E−05   1.2613E−04 R4 −6.4762E+02  −2.9752E−02 3.4361E−02 −1.8931E−02 1.1171E−02 −7.6361E−03 R5 1.0000E+03 −1.7944E−02 3.0631E−02 −1.2998E−02 1.2962E−02 −1.8317E−02 R6 1.1231E+00 −1.1397E−01 7.9562E−02 −5.0891E−02 5.8097E−02 −8.7859E−02 R7 −2.8459E−01  −1.5313E−01 2.8289E−02  1.5846E−02 2.1490E−03 −1.0395E−01 R8 −1.7459E+01   3.0690E−02 −3.2812E−02  −1.3397E−01 7.6175E−01 −1.7208E+00 R9 −8.4606E+02  −9.8736E−02 5.0670E−02  3.1494E−01 −7.5248E−01   1.2086E+00 R10 −5.0070E+01  −4.2466E−02 1.7662E−01 −4.0352E−01 1.1680E+00 −2.4716E+00 R11 1.0000E+03 −1.0418E−01 −5.8519E−02   2.5322E−01 −6.7328E−01   1.0506E+00 R12 8.4678E+01 −9.3380E−02 3.3945E−02 −8.9908E−02 1.8015E−01 −2.4099E−01 R13 −5.0475E+01  −1.4587E−01 1.2567E−03  8.3911E−02 −2.7577E−01   3.3228E−01 R14 −2.5740E+01  −1.9041E−01 1.9748E−01 −2.1642E−01 1.0456E−01 −4.2181E−03 R15 2.1026E+01 −2.9957E−01 4.2802E−01 −3.7319E−01 2.0807E−01 −7.5643E−02 R16 2.8319E+01 −2.8732E−01 3.2530E−01 −2.6792E−01 1.5535E−01 −6.2191E−02 Conic coefficient Aspheric surface coefficients k A14 A16 A18 A20 R1 6.2697E−02 −3.5533E−03   1.0970E−03 −2.0855E−04   1.6274E−05 R2 3.9721E+02 −2.1986E−05   1.7289E−05 4.7623E−08  8.8584E−08 R3 4.6622E+02 5.6955E−05 −1.0372E−05 −4.1243E−07   4.5565E−07 R4 −6.4762E+02  5.2308E−03 −2.2503E−03 5.0713E−04 −4.9398E−05 R5 1.0000E+03 1.5292E−02 −7.1679E−03 1.7991E−03 −1.8790E−04 R6 1.1231E+00 8.0566E−02 −4.5629E−02 1.4357E−02 −1.8305E−03 R7 −2.8459E−01  1.3592E−01 −7.5889E−02 2.0702E−02 −2.3292E−03 R8 −1.7459E+01  2.3045E+00 −1.8402E+00 8.2002E−01 −1.5658E−01 R9 −8.4606E+02  −1.3830E+00   1.0377E+00 −4.3297E−01   7.3589E−02 R10 −5.0070E+01  3.4184E+00 −2.8993E+00 1.3611E+00 −2.6869E−01 R11 1.0000E+03 −1.0447E+00   6.6128E−01 −2.5368E−01   4.6198E−02 R12 8.4678E+01 2.0004E−01 −9.7065E−02 2.4147E−02 −2.0995E−03 R13 −5.0475E+01  −2.0026E−01   6.5946E−02 −1.1336E−02   7.9440E−04 R14 −2.5740E+01  −1.5202E−02   6.1312E−03 −1.0031E−03   6.2262E−05 R15 2.1026E+01 1.8042E−02 −2.7521E−03 2.4592E−04 −9.8671E−06 R16 2.8319E+01 1.6535E−02 −2.7641E−03 2.6203E−04 −1.0721E−05

In table 2, K is a conic coefficient, and A4, A6, A8, A10, A12, A14, A16, A18 and A20 are aspheric surface coefficients.

y=(x ² /R)/{1+[1−(k+1)(x ² /R ²)]^(1/2) }+A4x ⁴ +A6x ⁶ +A8x ⁸ +A10x ¹⁰ +A12x ¹² +A14x ¹⁴ +A16x ¹⁶ +A18x ¹⁸ +A20x ²⁰  (4)

Herein, x denotes a vertical distance between a point in the aspheric curve and the optical axis, and y denotes an aspheric depth (i.e. a vertical distance between the point having a distance of x from the optical axis and a plane tangent to the vertex on the optical axis of the aspheric surface).

For convenience, an aspheric surface of each lens surface uses the aspheric surfaces shown in the above formula (1). However, the present disclosure is not limited to the aspherical polynomials form shown in the formula (1).

Table 3 and Table 4 show design data of inflexion points and arrest points of each lens of the camera optical lens 10 according to Embodiment 1 of the present disclosure. P1R1 and P1R2 represent the object-side surface and the image-side surface of the first lens L1, P2R1 and P2R2 represent the object-side surface and the image-side surface of the second lens L2, P3R1 and P3R2 represent the object-side surface and the image-side surface of the third lens L3, P4R1 and P4R2 represent the object-side surface and the image-side surface of the fourth lens L4, P5R1 and P5R2 represent the object-side surface and the image-side surface of the fifth lens L5, P6R1 and P6R2 represent the object-side surface and the image-side surface of the sixth lens L6, P7R1 and P7R2 represent the object-side surface and the image-side surface of the seventh lens L7, and P8R1 and P8R2 represent the object-side surface and the image-side surface of the eighth lens L8. The data in the column named “inflexion point position” refers to vertical distances from inflexion points arranged on each lens surface to the optic axis of the camera optical lens 10. The data in the column named “arrest point position” refers to vertical distances from arrest points arranged on each lens surface to the optical axis of the camera optical lens 10.

TABLE 3 Number(s) of Inflexion point Inflexion point Inflexion point inflexion points position 1 position 2 position 3 P1R1 1 1.505 / / P1R2 1 1.305 / / P2R1 0 / / / P2R2 1 0.785 / / P3R1 1 0.565 / / P3R2 1 1.025 / / P4R1 1 0.685 / / P4R2 0 / / / P5R1 2 0.235 0.575 / P5R2 0 / / / P6R1 0 / / / P6R2 1 1.285 / / P7R1 2 0.325 1.385 / P7R2 1 0.365 / / P8R1 2 1.435 2.025 / P8R2 3 0.165 2.045 2.205

TABLE 4 Number(s) of Arrest point Arrest point arrest points position 1 position 2 P1R1 0 / / P1R2 0 / / P2R1 0 / / P2R2 1 1.135 / P3R1 1 0.775 / P3R2 0 / / P4R1 1 1.145 / P4R2 0 / / P5R1 2 0.475 0.635 P5R2 0 / / P6R1 0 / / P6R2 0 / / P7R1 1 0.575 / P7R2 1 0.695 / P8R1 0 / / P8R2 1 0.285 /

FIG. 2 and FIG. 3 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm and 436 nm after passing the camera optical lens 10 in Embodiment 1, respectively. FIG. 4 illustrates a schematic diagram of a field curvature and a distortion of light with a wavelength of 546 nm after passing the camera optical lens 10 in Embodiment 1. A field curvature S in FIG. 4 is a field curvature in a sagittal direction, and T is a field curvature in a tangential direction.

In the subsequent Table 13, various parameters of Embodiments 1, 2 and 3 and values corresponding to the parameters specified in the above conditions are shown.

As shown in Table 13, Embodiment 1 satisfies the various conditions.

In this Embodiment, an entrance pupil diameter (ENPD) of the camera optical lens 10 is 3.300 mm, an image height (IH) of 1.0H is 2.750 mm, and a field of view (FOV) in a diagonal direction is 47.48°. Thus, the camera optical lens 10 achieves large aperture, long focal length and ultra-thinness, the on-axis and off-axis chromatic aberration is sufficiently corrected, thereby achieving excellent optical performance.

Embodiment 2

Embodiment 2, which provides a camera optical lens 20 structurally shown in FIG. 5, is basically the same as Embodiment 1 and involves symbols having the same meanings as Embodiment 1, and only differences therebetween will be described in the following.

Table 5 and Table 6 show design data of a camera optical lens 20 in Embodiment 2 of the present disclosure.

TABLE 5 R d nd νd S1 ∞ d0= −0.843 R1 1.862 d1= 0.948 nd1 1.5444 ν1 55.82 R2 28.909 d2= 0.060 R3 32.557 d3= 0.394 nd2 1.5444 ν2 55.82 R4 −8.467 d4= 0.030 R5 −58.733 d5= 0.240 nd3 1.6701 ν3 19.39 R6 2.384 d6= 0.130 R7 1.877 d7= 0.280 nd4 1.6400 ν4 23.54 R8 2.668 d8= 0.211 R9 96.645 d9= 0.240 nd5 1.5444 ν5 55.82 R10 4.416 d10= 0.438 R11 −861.451 d11= 0.372 nd6 1.6701 ν6 19.39 R12 −12.815 d12= 0.589 R13 3.667 d13= 0.240 nd7 1.5444 ν7 55.82 R14 2.666 d14= 0.444 R15 −34.715 d15= 0.550 nd8 1.5444 ν8 55.82 R16 10.081 d16= 0.303 R17 ∞ d17= 0.110 ndg 1.5168 νg 64.17 R18 ∞ d18= 0.389

Table 6 shows aspheric surface data of each lens of the camera optical lens 20 in Embodiment 2 of the present disclosure.

TABLE 6 Conic coefficient Aspheric surface coefficients k A4 A6 A8 A10 A12 R1  6.3670E−02 −8.9300E−03 2.6799E−03  2.2823E−03 −7.9993E−03   7.0315E−03 R2  2.7058E+02  1.8266E−02 2.1752E−03 −7.5123E−04 −4.2062E−04  −1.5122E−04 R3  2.5688E+02  2.1860E−02 1.6422E−03 −3.2883E−04 −7.2669E−05   1.2955E−04 R4 −2.1216E+02 −2.6096E−02 3.4649E−02 −1.9173E−02 1.1096E−02 −7.6461E−03 R5 −2.9537E+02 −1.5350E−02 2.9515E−02 −1.3225E−02 1.2931E−02 −1.8301E−02 R6  1.0296E+00 −1.1804E−01 8.0873E−02 −5.2241E−02 5.7808E−02 −8.7626E−02 R7 −1.9635E−01 −1.4735E−01 2.3129E−02  1.5315E−02 2.8731E−03 −1.0326E−01 R8 −1.8990E+01  1.6307E−02 −3.8173E−02  −1.3073E−01 7.6394E−01 −1.7215E+00 R9 −6.7861E+02 −1.0321E−01 5.7740E−02  3.1032E−01 −7.5407E−01   1.2097E+00 R10 −6.5447E+01 −3.5251E−02 1.7845E−01 −4.0511E−01 1.1679E+00 −2.4717E+00 R11 −7.2026E+02 −9.9865E−02 −6.1167E−02   2.5483E−01 −6.7465E−01   1.0515E+00 R12  8.8011E+01 −8.9490E−02 3.2862E−02 −9.0519E−02 1.8095E−01 −2.4095E−01 R13 −6.0341E+01 −1.4906E−01 2.4076E−03  8.4045E−02 −2.7571E−01   3.3230E−01 R14 −2.8090E+01 −1.9174E−01 1.9808E−01 −2.1647E−01 1.0455E−01 −4.2029E−03 R15  1.5697E+02 −3.0417E−01 4.2829E−01 −3.7309E−01 2.0808E−01 −7.5644E−02 R16  1.7949E+01 −2.9043E−01 3.2557E−01 −2.6790E−01 1.5534E−01 −6.2192E−02 Conic coefficient Aspheric surface coefficients k A14 A16 A18 A20 R1  6.3670E−02 −3.5488E−03   1.0969E−03 −2.0855E−04   1.6274E−05 R2  2.7058E+02 −2.0117E−05   1.6477E−05 4.7623E−08  8.8584E−08 R3  2.5688E+02 5.8841E−05 −1.4656E−05 −4.1243E−07   4.5565E−07 R4 −2.1216E+02 5.2337E−03 −2.2428E−03 5.0713E−04 −4.9398E−05 R5 −2.9537E+02 1.5313E−02 −7.1631E−03 1.7991E−03 −1.8790E−04 R6  1.0296E+00 8.0717E−02 −4.5581E−02 1.4357E−02 −1.8305E−03 R7 −1.9635E−01 1.3623E−01 −7.6024E−02 2.0702E−02 −2.3292E−03 R8 −1.8990E+01 2.3029E+00 −1.8391E+00 8.2002E−01 −1.5658E−01 R9 −6.7861E+02 −1.3809E+00   1.0368E+00 −4.3297E−01   7.3589E−02 R10 −6.5447E+01 3.4175E+00 −2.8982E+00 1.3611E+00 −2.6869E−01 R11 −7.2026E+02 −1.0439E+00   6.6050E−01 −2.5368E−01   4.6198E−02 R12  8.8011E+01 1.9996E−01 −9.7047E−02 2.4147E−02 −2.0995E−03 R13 −6.0341E+01 −2.0025E−01   6.5940E−02 −1.1336E−02   7.9440E−04 R14 −2.8090E+01 −1.5198E−02   6.1294E−03 −1.0031E−03   6.2262E−05 R15  1.5697E+02 1.8042E−02 −2.7521E−03 2.4592E−04 −9.8671E−06 R16  1.7949E+01 1.6535E−02 −2.7641E−03 2.6203E−04 −1.0721E−05

Table 7 and table 8 show design data of inflexion points and arrest points of each lens of the camera optical lens 20 in Embodiment 2 of the present disclosure.

TABLE 7 Number(s) of Inflexion point Inflexion point Inflexion point inflexion points position 1 position 2 position 3 P1R1 1 1.515 / / P1R2 1 1.285 / / P2R1 0 / / / P2R2 1 0.755 / / P3R1 1 0.575 / / P3R2 1 0.995 / / P4R1 1 0.645 / / P4R2 0 / / / P5R1 2 0.095 0.585 / P5R2 0 / / / P6R1 0 / / / P6R2 1 1.285 / / P7R1 2 0.305 1.375 / P7R2 1 0.355 / / P8R1 2 1.445 2.035 / P8R2 3 0.185 2.035 2.215

TABLE 8 Number(s) of Arrest point Arrest point arrest points position 1 position 2 P1R1 0 / / P1R2 1 1.595 / P2R1 0 / / P2R2 1 1.155 / P3R1 1 0.815 / P3R2 0 / / P4R1 1 1.105 / P4R2 0 / / P5R1 2 0.165 0.745 P5R2 0 / / P6R1 0 / / P6R2 0 / / P7R1 1 0.555 / P7R2 1 0.675 / P8R1 0 / / P8R2 1 0.315 /

FIG. 6 and FIG. 7 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm and 436 nm after passing the camera optical lens 20 in Embodiment 2, respectively. FIG. 8 illustrates a schematic diagram of a field curvature and a distortion of light with a wavelength of 546 nm after passing the camera optical lens 20 in Embodiment 2. A field curvature S in FIG. 8 is a field curvature in a sagittal direction, and T is a field curvature in a tangential direction.

As shown in the subsequent Table 13, the camera optical lens 20 in Embodiment 2 satisfies the various conditions.

In this embodiment, an entrance pupil diameter (ENPD) of the camera optical lens 20 is 3.301 mm, an image height (IH) of 1.0H is 2.750 mm, and a field of view (FOV) in the diagonal direction is 47.46°. Thus, the camera optical lens 20 achieves long focal length and ultra-thinness, the on-axis and off-axis chromatic aberration is sufficiently corrected, thereby achieving excellent optical performance.

Embodiment 3

Embodiment 3, which provides a camera optical lens 30 structurally shown in FIG. 9, is basically the same as Embodiment 1 and involves symbols having the same meanings as Embodiment 1, and only differences therebetween will be described in the following.

In this embodiment, the third lens L3 includes an object-side surface being convex in a paraxial region.

Table 9 and Table 10 show design data of a camera optical lens 30 in Embodiment 3 of the present disclosure.

TABLE 9 R d nd νd S1 ∞ d0= −0.846 R1 1.849 d1= 0.942 nd1 1.5444 ν1 55.82 R2 36.432 d2= 0.060 R3 48.902 d3= 0.377 nd2 1.5444 ν2 55.82 R4 −25.511 d4= 0.041 R5 872985.222 d5= 0.240 nd3 1.6701 ν3 19.39 R6 2.361 d6= 0.109 R7 1.665 d7= 0.280 nd4 1.6400 ν4 23.54 R8 2.427 d8= 0.221 R9 7.917 d9= 0.240 nd5 1.5444 ν5 55.82 R10 3.134 d10= 0.462 R11 −207.625 d11= 0.365 nd6 1.6701 ν6 19.39 R12 −13.245 d12= 0.604 R13 3.322 d13= 0.240 nd7 1.5444 ν7 55.82 R14 2.457 d14= 0.457 R15 −178.990 d15= 0.533 nd8 1.5444 ν8 55.82 R16 9.818 d16= 0.309 R17 ∞ d17= 0.110 ndg 1.5168 νg 64.17 R18 ∞ d18= 0.388

Table 10 shows aspheric surface data of each lens of the camera optical lens 30 in Embodiment 3 of the present disclosure.

TABLE 10 Conic coefficient Aspheric surface coefficients k A4 A6 A8 A10 A12 R1  5.7049E−02 −9.9554E−03 2.8262E−03  2.1789E−03 −7.9981E−03   7.0380E−03 R2  4.5942E+02  1.9418E−02 3.1455E−03 −6.3428E−04 −4.6040E−04  −1.7926E−04 R3  6.6547E+02  2.7723E−02 9.3157E−04 −5.8659E−04 −6.2751E−05   1.6536E−04 R4 −8.5787E+02 −3.1007E−02 3.4406E−02 −1.8707E−02 1.1216E−02 −7.6311E−03 R5 −6.7579E+02 −1.6973E−02 3.1388E−02 −1.3235E−02 1.2886E−02 −1.8295E−02 R6  1.3087E+00 −1.0597E−01 7.8106E−02 −5.0579E−02 5.8139E−02 −8.8326E−02 R7 −2.8725E−01 −1.5378E−01 3.0312E−02  1.5717E−02 1.4750E−03 −1.0408E−01 R8 −1.6768E+01  3.5495E−02 −3.7607E−02  −1.3955E−01 7.6193E−01 −1.7179E+00 R9 −4.8016E+02 −1.0268E−01 4.6657E−02  3.1579E−01 −7.5278E−01   1.2091E+00 R10 −4.1762E+01 −5.3259E−02 1.8076E−01 −4.0144E−01 1.1668E+00 −2.4723E+00 R11  1.0000E+03 −1.0993E−01 −6.2912E−02   2.5770E−01 −6.7360E−01   1.0487E+00 R12  9.1872E+01 −9.8951E−02 3.5037E−02 −9.0728E−02 1.8024E−01 −2.4108E−01 R13 −4.9049E+01 −1.4903E−01 2.2047E−03  8.3626E−02 −2.7573E−01   3.3229E−01 R14 −2.3487E+01 −1.9184E−01 1.9755E−01 −2.1658E−01 1.0452E−01 −4.1995E−03 R15  2.9006E+02 −3.0618E−01 4.2817E−01 −3.7311E−01 2.0807E−01 −7.5645E−02 R16  1.7180E+01 −2.9004E−01 3.2556E−01 −2.6791E−01 1.5534E−01 −6.2192E−02 Conic coefficient Aspheric surface coefficients k A14 A16 A18 A20 R1  5.7049E−02 −3.5516E−03   1.0963E−03 −2.0855E−04   1.6274E−05 R2  4.5942E+02 −2.4505E−05   1.9048E−05 4.7623E−08  8.8584E−08 R3  6.6547E+02 6.4278E−05 −1.6768E−05 −4.1243E−07   4.5565E−07 R4 −8.5787E+02 5.2316E−03 −2.2547E−03 5.0713E−04 −4.9398E−05 R5 −6.7579E+02 1.5304E−02 −7.1725E−03 1.7991E−03 −1.8790E−04 R6  1.3087E+00 8.0264E−02 −4.5513E−02 1.4357E−02 −1.8305E−03 R7 −2.8725E−01 1.3609E−01 −7.5955E−02 2.0702E−02 −2.3292E−03 R8 −1.6768E+01 2.3057E+00 −1.8412E+00 8.2002E−01 −1.5658E−01 R9 −4.8016E+02 −1.3811E+00   1.0368E+00 −4.3297E−01   7.3589E−02 R10 −4.1762E+01 3.4178E+00 −2.8981E+00 1.3611E+00 −2.6869E−01 R11  1.0000E+03 −1.0457E+00   6.6302E−01 −2.5368E−01   4.6198E−02 R12  9.1872E+01 2.0022E−01 −9.7035E−02 2.4147E−02 −2.0995E−03 R13 −4.9049E+01 −2.0025E−01   6.5945E−02 −1.1336E−02   7.9440E−04 R14 −2.3487E+01 −1.5195E−02   6.1297E−03 −1.0031E−03   6.2262E−05 R15  2.9006E+02 1.8042E−02 −2.7519E−03 2.4592E−04 −9.8671E−06 R16  1.7180E+01 1.6535E−02 −2.7641E−03 2.6203E−04 −1.0721E−05

Table 11 and Table 12 show design data of inflexion points and arrest points of each lens in the camera optical lens 30 in Embodiment 3 of the present disclosure.

TABLE 11 Number(s) of Inflexion point Inflexion point Inflexion point inflexion points position 1 position 2 position 3 P1R1 1 1.515 / / P1R2 1 1.305 / / P2R1 0 / / / P2R2 1 0.805 / / P3R1 1 0.515 / / P3R2 1 1.045 / / P4R1 1 0.715 / / P4R2 0 / / / P5R1 2 0.255 0.595 / P5R2 0 / / / P6R1 0 / / / P6R2 1 1.265 / / P7R1 2 0.325 1.385 / P7R2 1 0.365 / / P8R1 2 1.485 2.025 / P8R2 3 0.185 2.065 2.215

TABLE 12 Number(s) of Arrest point arrest points position 1 P1R1 0 / P1R2 0 / P2R1 0 / P2R2 1 1.115 P3R1 1 0.665 P3R2 0 / P4R1 1 1.185 P4R2 0 / P5R1 0 / P5R2 0 / P6R1 0 / P6R2 0 / P7R1 1 0.575 P7R2 1 0.705 P8R1 0 / P8R2 1 0.325

FIG. 10 and FIG. 11 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm and 436 nm after passing the camera optical lens 30 in Embodiment 3, respectively. FIG. 12 illustrates a schematic diagram of a field curvature and a distortion of light with a wavelength of 546 nm after passing the camera optical lens 30 in Embodiment 3. A field curvature S in FIG. 12 is a field curvature in a sagittal direction, and T is a field curvature in a tangential direction.

The subsequent Table 13 lists values corresponding to the various conditions in the embodiments according to the above conditions. Apparently, the camera optical lens 30 in Embodiment 3 satisfies the various conditions.

In this embodiment, an entrance pupil diameter (ENPD) of the camera optical lens 30 is 3.306 mm, an image height (IH) of 1.0H is 2.750 mm, and a field of view (FOV) in the diagonal direction is 47.39°. Thus, the camera optical lens 30 achieves long focal length and ultra-thinness, the on-axis and off-axis chromatic aberration is sufficiently corrected, thereby achieving excellent optical performance.

TABLE 13 Parameters and Embodiment Embodiment Embodiment conditions 1 2 3 f/TTL 1.03 1.03 1.03 f2/f 3.59 2.01 5.00 (R15 + R16)/(R15 − R16) 0.20 0.55 0.90 f  6.139 6.140 6.149 f1  3.547 3.596 3.529 f2  22.038 12.332 30.720 f3  −3.463 −3.373 −3.481 f4  7.763 8.609 7.177 f5  −9.497 −8.471 −9.659 f6  19.688 19.177 20.844 f7  −23.307 −19.509 −19.124 f8  −13.672 −14.228 −17.008 f12 3.164 2.953 3.246 FNO 1.86 1.86 1.86 TTL 5.968 5.968 5.978 IH 2.750 2.750 2.750 FOV 47.48° 47.46° 47.39°

It will be understood by those of ordinary skill in the art that the embodiments described above are specific embodiments realizing the present disclosure, and that in practical applications, various changes may be made thereto in form and in detail without departing from the range and scope of the disclosure. 

What is claimed is:
 1. A camera optical lens comprising, from an object side to an image side in sequence: a first lens, a second, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens; wherein the first lens has a positive refractive power, and the camera optical lens satisfies conditions of: 0.95≤f/TTL; 2.00≤f2/f≤5.00; and 0.20≤(R15+R16)/(R15−R16)≤0.90; where TTL denotes a total optical length from an object-side surface of the first lens to an image surface of the camera optical lens along an optical axis; f denotes a focal length of the camera optical lens; f2 denotes a focal length of the second lens; R15 denotes a central curvature radius of an object-side surface of the eighth lens; and R16 denotes a central curvature radius of an image-side surface of the eighth lens.
 2. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies a condition of: 2.50≤R9/R10≤22.00; where R9 denotes a curvature radius of an object-side surface of the fifth lens; and R10 denotes a curvature radius of an image-side surface of the fifth lens.
 3. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies conditions of: 0.29≤f1/f≤0.88; −2.28≤(R1+R2)/(R1−R2)≤−0.74; and 0.08≤d1/TTL≤0.24; where f1 denotes a focal length of the first lens; R1 denotes a central curvature radius of the object-side surface of the first lens; R2 denotes a central curvature radius of an image-side surface of the first lens; and d1 denotes an on-axis thickness of the first lens.
 4. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies conditions of: 0.16≤(R3+R4)/(R3−R4)≤0.88; and 0.03≤d3/TTL≤0.10; where R3 denotes a central curvature radius of an object-side surface of the second lens; R4 denotes a central curvature radius of an image-side surface of the second lens; and d3 denotes an on-axis thickness of the second lens.
 5. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies conditions of: −1.13≤f3/f≤−0.37; 0.46≤(R5+R6)/(R5−R6)≤1.50; and 0.02≤d5/TTL≤0.06; where f3 denotes a focal length of the third lens; R5 denotes a central curvature radius of an object-side surface of the third lens; R6 denotes a central curvature radius of an image-side surface of the third lens; and d5 denotes an on-axis thickness of the third lens.
 6. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies conditions of: 0.58≤f4/f≤2.10; −11.49≤(R7+R8)/(R7−R8)≤−3.58; and 0.02≤d7/TTL≤0.07; where f4 denotes a focal length of the fourth lens; R7 denotes a central curvature radius of an object-side surface of the fourth lens; R8 denotes a central curvature radius of an image-side surface of the fourth lens; and d7 denotes an on-axis thickness of the fourth lens.
 7. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies following conditions: −3.14≤f5/f≤−0.92; 0.55≤(R9+R10)/(R9−R10)≤3.47; and 0.02≤d9/TTL≤0.06; where f5 denotes a focal length of the fifth lens; R9 denotes a curvature radius of an object-side surface of the fifth lens; R10 denotes a curvature radius of an image-side surface of the fifth lens; and d9 denotes an on-axis thickness of the fifth lens.
 8. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies a condition of: 1.56≤f6/f≤5.08; 0.52≤(R11+R12)/(R11−R12)≤1.70; and 0.03≤d11/TTL≤0.09; where f6 denotes a focal length of the sixth lens; R11 denotes a central curvature radius of an object-side surface of the sixth lens; R12 denotes a central curvature radius of an image-side surface of the sixth lens; and d11 denotes an on-axis thickness of the sixth lens.
 9. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies a condition of: −7.59≤f7/f≤−2.07; 3.16≤(R13+R14)/(R13−R14)≤11.46; and 0.02≤d13/TTL≤0.06; where f7 denotes a focal length of the seventh lens; R13 denotes a central curvature radius of an object-side surface of the seventh lens; R14 denotes a central curvature radius of an image-side surface of the seventh lens; and d13 denotes an on-axis thickness of the seventh lens.
 10. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies a condition of: −5.53≤f8/f≤−1.48; and 0.04≤d15/TTL≤0.14; where f8 denotes a focal length of the eighth lens; and d15 denotes an on-axis thickness of the eighth lens.
 11. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies a condition of: FNO≤1.87; where FNO denotes an F number of the camera optical lens.
 12. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies a condition of: f/IH≥2.23; where IH denotes an image height of the camera optical lens.
 13. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies a condition of: TTL/IH≤2.18; where IH denotes an image height of the camera optical lens. 